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Ubuntu 16.04 ESM: USN-5572-1 Critical: AWS Kernel Information Exposure

ubuntu
Calendar Grey August 18, 2022
Dist Ubuntu Esm H88
Multiple security flaws have been addressed in the Linux kernel for Ubuntu 16.04 ESM. Ensure your systems are updated immediately.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

Details:

Roger Pau Monné discovered that the Xen virtual block driver in the

Linux kernel did not properly initialize memory pages to be used for

shared communication with the backend. A local attacker could use this

to expose sensitive information (guest kernel memory). (CVE-2022-26365)

Roger Pau Monné discovered that the Xen paravirtualization frontend in

the Linux kernel did not properly initialize memory pages to be used for

shared communication with the backend. A local attacker could use this

to expose sensitive information (guest kernel memory). (CVE-2022-33740)

It was discovered that the Xen paravirtualization frontend in the Linux

kernel incorrectly shared unrelated data when communicating with certain

backends. A local attacker could use this to cause a denial of service

(guest crash) or expose sens...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical information exposure ubuntu linux-aws

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
   linux-image-4.4.0-1148-aws      4.4.0-1148.163
   linux-image-aws                 4.4.0.1148.152

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

https://ubuntu.com/security/notices/USN-5572-1

CVE-2022-26365, CVE-2022-33740, CVE-2022-33741

Severity
critical
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Critical

August 18, 2022

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical information exposure ubuntu linux-aws

Package Information

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